Element::getSectionParents

public function getSectionParents($sectionId)
{
	if (!isset(self::$sectionParents[$sectionId]))
	{
		$sections = array();
		$sectionList = CIBlockSection::getNavChain($this->iblockId, $sectionId, array("ID"));
		while ($section = $sectionList->fetch())
		{
			$sections[] = $section["ID"];
		}
		self::$sectionParents[$sectionId] = $sections;
	}
	return self::$sectionParents[$sectionId];
}