acf.php

<?php

/**
 * ACF Rule Values: Page Ancestor
 *
 * @author Bill Erickson
 * @see http://www.billerickson.net/acf-custom-location-rules
 *
 * @param array $choices, available rule values for this type
 * @return array
 */
function ea_acf_rule_values_page_ancestor( $choices ) {

	// Copied from acf/core/controllers/field_group.php
	// @see http://bit.ly/1Xnx44g
	
	$post_type = 'page';
	$posts = get_posts(array(
		'posts_per_page'			=>	-1,
		'post_type'					=> $post_type,
		'orderby'					=> 'menu_order title',
		'order'						=> 'ASC',
		'post_status'				=> 'any',
		'suppress_filters'			=> false,
		'update_post_meta_cache'	=> false,
	));
	
	if( $posts )
	{
		// sort into hierachial order!
		if( is_post_type_hierarchical( $post_type ) )
		{
			$posts = get_page_children( 0, $posts );
		}
		
		foreach( $posts as $page )
		{
			$title = '';
			$ancestors = get_ancestors($page->ID, 'page');
			if($ancestors)
			{
				foreach($ancestors as $a)
				{
					$title .= '- ';
				}
			}
			
			$title .= apply_filters( 'the_title', $page->post_title, $page->ID );
			
			
			// status
			if($page->post_status != "publish")
			{
				$title .= " ($page->post_status)";
			}
			
			$choices[ $page->ID ] = $title;
			
		}
	
	}
	
	return $choices;
}
add_filter( 'acf/location/rule_values/page_ancestor', 'ea_acf_rule_values_page_ancestor' );