return only the top level terms of the object/s

functions.php

/**
 * get top level object terms
 * @package default
 * @version 1.0
**/
function _get_object_parent_terms ($object, $taxonomies, $args = array()) {

    $object_terms = wp_get_object_terms($object, $taxonomies, $args);
	
	$output = array();
	
	foreach ($object_terms as $object_term)
		if ($object_term->parent == 0)
			array_push($output, $object_term);
	
	return $output;
}