я еще не зарелизил официально

[[!pdoCrumbs? &limit=`3` &showCurrent=`0` &to=`[[+id]]`]]

[[!pdoCrumbs? &limit=`2` &showCurrent=`1` &from=`[[+parent]]`]]

[[!pdoCrumbs? &limit=`2` &showCurrent=`1` &from=`[[+id]]`]]

public function setUserGroups() {
	$memberships = array();
	$groups = $this->getProperty('groups',null);
	if ($groups !== null) {
		$primaryGroupId = 0;
		/* remove prior user group links */
		$oldMemberships = $this->object->getMany('UserGroupMembers');
		/** @var modUserGroupMember $membership */
		foreach ($oldMemberships as $membership) { $membership->remove(); }

		/* create user group links */
		$groupsAdded = array();
		$groups = is_array($groups) ? $groups : $this->modx->fromJSON($groups);
		$idx = 0;
		foreach ($groups as $group) {
			if (in_array($group['usergroup'],$groupsAdded)) continue;
			$membership = $this->modx->newObject('modUserGroupMember');
			$membership->set('user_group',$group['usergroup']);
			$membership->set('role',$group['role']);
			$membership->set('member',$this->object->get('id'));
			$membership->set('rank',isset($group['rank']) ? $group['rank'] : $idx);
			if (empty($group['rank'])) {
				$primaryGroupId = $group['usergroup'];
			}
			$memberships[] = $membership;
			$groupsAdded[] = $group['usergroup'];
			$idx++;
		}
		$this->object->addMany($memberships,'UserGroupMembers');
		$this->object->set('primary_group',$primaryGroupId);
	}
	return $memberships;
}

Держи новую версию pdoTools — там добавлен сниппет pdoCrumbs, который выводит родителей от указанного ресурса.