Check for page template deep

gistfile1.php

<?php
/**
 * Checks if current or top level pages has a specific page template set.
 *
 * @param string
 * @return mixed false or page id
 */
function ja_is_page_template_deep( $template = '' ) {
	if ( !empty( $template ) && is_page() ) {
		$parents  = get_post_ancestors( get_the_ID() );
		$id       = ( $parents ) ? $parents[count($parents)-1]: get_the_ID();
		if ( !empty( $id ) && get_page_template_slug( $id ) == $template ) {
			return $id;
		}
	}
	return false;
}