Sharing::getParent

public function getParent()
{
	if(!$this->parentId)
	{
		return null;
	}

	if(isset($this->parent) && $this->parentId === $this->parent->getId())
	{
		return $this->parent;
	}
	$this->parent = Sharing::loadById($this->parentId);

	return $this->parent;
}