You can use below code: 

$args = array(
    \'type\'                     => \'product\',
    \'child_of\'                 => 0,
    \'parent\'                   => \'\',
    \'orderby\'                  => \'term_group\',
    \'hide_empty\'               => false,
    \'hierarchical\'             => 1,
    \'exclude\'                  => \'\',
    \'include\'                  => \'\',
    \'number\'                   => \'\',
    \'taxonomy\'                 => \'product_cat\',
    \'pad_counts\'               => false
);

$cats = get_categories( $args );