WP REST API v2. filters doesn’t work

I found answer here https://1fix.io/blog/2015/02/28/wordpress-rest-api-media/.

add_action( 'rest_api_init', 'add_filter' );
add_filter( 'query_vars', function( $query_vars ) {
$query_vars[] = 'post_parent';
return $query_vars;
});

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