cleanup: remove long depricated share code

apps/files_sharing/lib/ShareBackend/Folder.php

@@ -29,65 +29,6 @@
 namespace OCA\Files_Sharing\ShareBackend;
 
 class Folder extends File implements \OCP\Share_Backend_Collection {
-
- /**
- * get shared parents
- *
- * @param int $itemSource item source ID
- * @param string $shareWith with whom should the item be shared
- * @param string $owner owner of the item
- * @return array with shares
- */
- public function getParents($itemSource, $shareWith = null, $owner = null) {
- $result = [];
- $parent = $this->getParentId($itemSource);
-
- $userManager = \OC::$server->getUserManager();
-
- while ($parent) {
- $shares = \OCP\Share::getItemSharedWithUser('folder', $parent, $shareWith, $owner);
- if ($shares) {
- foreach ($shares as $share) {
- $name = basename($share['path']);
- $share['collection']['path'] = $name;
- $share['collection']['item_type'] = 'folder';
- $share['file_path'] = $name;
-
- $ownerUser = $userManager->get($share['uid_owner']);
- $displayNameOwner = $ownerUser === null ? $share['uid_owner'] : $ownerUser->getDisplayName();
- $shareWithUser = $userManager->get($share['share_with']);
- $displayNameShareWith = $shareWithUser === null ? $share['share_with'] : $shareWithUser->getDisplayName();
- $share['displayname_owner'] = $displayNameOwner ? $displayNameOwner : $share['uid_owner'];
- $share['share_with_displayname'] = $displayNameShareWith ? $displayNameShareWith : $share['uid_owner'];
-
- $result[] = $share;
- }
- }
- $parent = $this->getParentId($parent);
- }
-
- return $result;
- }
-
- /**
- * get file cache ID of parent
- *
- * @param int $child file cache ID of child
- * @return mixed parent ID or null
- */
- private function getParentId($child) {
- $qb = \OC::$server->getDatabaseConnection()->getQueryBuilder();
- $qb->select('parent')
- ->from('filecache')
- ->where(
- $qb->expr()->eq('fileid', $qb->createNamedParameter($child))
- );
- $result = $qb->execute();
- $row = $result->fetch();
- $result->closeCursor();
- return $row ? $row['parent'] : null;
- }
-
  public function getChildren($itemSource) {
  $children = [];
  $parents = [$itemSource];