gistfile1.php

	/**
	 * Finds the nearest parent folder node of the provided node by looping recursively trough
	 * the node's parent nodes and checking if they are a sub content type of TYPO3.TYPO3CR:Folder
	 *
	 * @param \TYPO3\TYPO3CR\Domain\Model\NodeInterface $node
	 * @return \TYPO3\TYPO3CR\Domain\Model\NodeInterface|NULL
	 */
	protected function findNextParentFolderNode(\TYPO3\TYPO3CR\Domain\Model\NodeInterface $node) {
		$folderTypes = $this->contentTypeManager->getSubContentTypes('TYPO3.TYPO3CR:Folder');
		$check = function($node) use ($folderTypes) {
			if (array_key_exists($node->getContentType(), $folderTypes)) {
				return TRUE;
			}
		};
		if ($check($node, $folderTypes)) {
			return $node;
		}
		while ($node = $node->getParent()) {
			if ($check($node, $folderTypes)) {
				return $node;
			}
		}
		return NULL;
	}