/**
* {@inheritdoc}
*/
public function isAncestor(CategoryInterface $parentNode, CategoryInterface $childNode)
{
$sameRoot = $parentNode->getRoot() === $childNode->getRoot();
$isAncestor = $childNode->getLeft() > $parentNode->getLeft() && $childNode->getRight() < $parentNode->getRight();
return $sameRoot && $isAncestor;
}
