实际上你可以，下面是如何做到的：

此代码隐藏所有不属于当前登录作者的帖子和媒体（您可以将其更改为应用于其他用户角色）。它还修复了过滤条上的帖子和媒体计数（例如，所有|图像|视频|未附加）。

// Show only posts and media related to logged in author
add_action(\'pre_get_posts\', \'query_set_only_author\' );
function query_set_only_author( $wp_query ) {
    global $current_user;
    if( is_admin() && !current_user_can(\'edit_others_posts\') ) {
        $wp_query->set( \'author\', $current_user->ID );
        add_filter(\'views_edit-post\', \'fix_post_counts\');
        add_filter(\'views_upload\', \'fix_media_counts\');
    }
}

// Fix post counts
function fix_post_counts($views) {
    global $current_user, $wp_query;
    unset($views[\'mine\']);
    $types = array(
        array( \'status\' =>  NULL ),
        array( \'status\' => \'publish\' ),
        array( \'status\' => \'draft\' ),
        array( \'status\' => \'pending\' ),
        array( \'status\' => \'trash\' )
    );
    foreach( $types as $type ) {
        $query = array(
            \'author\'      => $current_user->ID,
            \'post_type\'   => \'post\',
            \'post_status\' => $type[\'status\']
        );
        $result = new WP_Query($query);
        if( $type[\'status\'] == NULL ):
            $class = ($wp_query->query_vars[\'post_status\'] == NULL) ? \' class="current"\' : \'\';
            $views[\'all\'] = sprintf(__(\'<a href="%s"\'. $class .\'>All <span class="count">(%d)</span></a>\', \'all\'),
                admin_url(\'edit.php?post_type=post\'),
                $result->found_posts);
        elseif( $type[\'status\'] == \'publish\' ):
            $class = ($wp_query->query_vars[\'post_status\'] == \'publish\') ? \' class="current"\' : \'\';
            $views[\'publish\'] = sprintf(__(\'<a href="%s"\'. $class .\'>Published <span class="count">(%d)</span></a>\', \'publish\'),
                admin_url(\'edit.php?post_status=publish&post_type=post\'),
                $result->found_posts);
        elseif( $type[\'status\'] == \'draft\' ):
            $class = ($wp_query->query_vars[\'post_status\'] == \'draft\') ? \' class="current"\' : \'\';
            $views[\'draft\'] = sprintf(__(\'<a href="%s"\'. $class .\'>Draft\'. ((sizeof($result->posts) > 1) ? "s" : "") .\' <span class="count">(%d)</span></a>\', \'draft\'),
                admin_url(\'edit.php?post_status=draft&post_type=post\'),
                $result->found_posts);
        elseif( $type[\'status\'] == \'pending\' ):
            $class = ($wp_query->query_vars[\'post_status\'] == \'pending\') ? \' class="current"\' : \'\';
            $views[\'pending\'] = sprintf(__(\'<a href="%s"\'. $class .\'>Pending <span class="count">(%d)</span></a>\', \'pending\'),
                admin_url(\'edit.php?post_status=pending&post_type=post\'),
                $result->found_posts);
        elseif( $type[\'status\'] == \'trash\' ):
            $class = ($wp_query->query_vars[\'post_status\'] == \'trash\') ? \' class="current"\' : \'\';
            $views[\'trash\'] = sprintf(__(\'<a href="%s"\'. $class .\'>Trash <span class="count">(%d)</span></a>\', \'trash\'),
                admin_url(\'edit.php?post_status=trash&post_type=post\'),
                $result->found_posts);
        endif;
    }
    return $views;
}

// Fix media counts
function fix_media_counts($views) {
    $_total_posts = array();
    $_num_posts = array();
    global $wpdb, $current_user, $post_mime_types, $avail_post_mime_types;
    $views = array();
    $count = $wpdb->get_results( "
        SELECT post_mime_type, COUNT( * ) AS num_posts 
        FROM $wpdb->posts 
        WHERE post_type = \'attachment\' 
        AND post_author = $current_user->ID 
        AND post_status != \'trash\' 
        GROUP BY post_mime_type
    ", ARRAY_A );
    foreach( $count as $row )
        $_num_posts[$row[\'post_mime_type\']] = $row[\'num_posts\'];
    $_total_posts = array_sum($_num_posts);
    $detached = isset( $_REQUEST[\'detached\'] ) || isset( $_REQUEST[\'find_detached\'] );
    if ( !isset( $total_orphans ) )
        $total_orphans = $wpdb->get_var("
            SELECT COUNT( * ) 
            FROM $wpdb->posts 
            WHERE post_type = \'attachment\' 
            AND post_author = $current_user->ID 
            AND post_status != \'trash\' 
            AND post_parent < 1
        ");
    $matches = wp_match_mime_types(array_keys($post_mime_types), array_keys($_num_posts));
    foreach ( $matches as $type => $reals )
        foreach ( $reals as $real )
            $num_posts[$type] = ( isset( $num_posts[$type] ) ) ? $num_posts[$type] + $_num_posts[$real] : $_num_posts[$real];
    $class = ( empty($_GET[\'post_mime_type\']) && !$detached && !isset($_GET[\'status\']) ) ? \' class="current"\' : \'\';
    $views[\'all\'] = "<a href=\'upload.php\'$class>" . sprintf( __(\'All <span class="count">(%s)</span>\', \'uploaded files\' ), number_format_i18n( $_total_posts )) . \'</a>\';
    foreach ( $post_mime_types as $mime_type => $label ) {
        $class = \'\';
        if ( !wp_match_mime_types($mime_type, $avail_post_mime_types) )
            continue;
        if ( !empty($_GET[\'post_mime_type\']) && wp_match_mime_types($mime_type, $_GET[\'post_mime_type\']) )
            $class = \' class="current"\';
        if ( !empty( $num_posts[$mime_type] ) )
            $views[$mime_type] = "<a href=\'upload.php?post_mime_type=$mime_type\'$class>" . sprintf( translate_nooped_plural( $label[2], $num_posts[$mime_type] ), $num_posts[$mime_type] ) . \'</a>\';
    }
    $views[\'detached\'] = \'<a href="upload.php?detached=1"\' . ( $detached ? \' class="current"\' : \'\' ) . \'>\' . sprintf( __( \'Unattached <span class="count">(%s)</span>\', \'detached files\' ), $total_orphans ) . \'</a>\';
    return $views;
}