Hide product parent if variation is out stock

functions.php

<?php 
  function tm_remove_product_stock_region($query) {

 	$product_variable = new WC_Product_Variable();
	$product_variations = $product_variable->get_available_variations();

// 	/** Get users region. */
 	$user_region = tm_get_user_region();

 	$post__in = array();

	foreach ( $product_variations as $variation ) {

 	    /** Get products regions. */
 	    $product_region = $variation['attributes']['attribute_pa_regions'];

 	    if ($user_region === $product_region && !$variation->is_in_stock()) {


 	      $post__in[] = $variation['product_id'];

 	      add_filter('woocommerce_product_is_visible', function($is_visible, $id) {
				$is_visible = false;
				return $is_visible;
 			}, 10,2);


 	    } else if ($user_region === $product_region && $variation->is_in_stock()) {

	      $post__in[] = $variation['product_id'];


			add_filter('woocommerce_product_is_visible', function($is_visible, $id) {
 				$is_visible = true;
 				return $is_visible;
			}, 10,2);


	    }

 	}

 	if(is_array($post__in) && $post__in != null){
	    $query->set('post__in', $post__in);
 	}

 	return $query;

 }

 add_action('pre_get_posts', 'tm_remove_product_stock_region', 10, 2);