How to display only child categories and products in woocommerce?

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function custom_product_hierarchy( $args ) {
    $args['hide_empty'] = 0;
    $args['parent'] = 0;
    return $args;
}
add_filter( 'woocommerce_product_categories_widget_args', 'custom_product_hierarchy' );

function custom_product_query( $q ) {
    $q->set( 'post_parent', 0 );
    return $q;
}
add_filter( 'woocommerce_product_query', 'custom_product_query' );