wp-graphql-ancestors.php

<?php
register_graphql_connection( [
			'fromType'      => 'HierarchicalContentNode',
			'toType'        => 'ContentNode',
			'fromFieldName' => 'ancestors',
			'description'   => __( 'Returns ancestors of the node. Default ordered as lowest (closest to the child) to highest (closest to the root).', 'wp-graphql' ),
			'resolve'       => function( Post $post, $args, $context, $info ) {
				$ancestors = get_ancestors( $post->ID, null, 'post_type' );
				if ( empty( $ancestors ) || ! is_array( $ancestors ) ) {
					return null;
				}
				$resolver = new PostObjectConnectionResolver( $post, $args, $context, $info );
				$resolver->set_query_arg( 'post__in', $ancestors );
				return $resolver->get_connection();
			}
		] );