/**
  * Correct the parent folders' ETags for all users shared the file at $target
  *
  * @param string $target
  */
 public static function correctFolders($target)
 {
     // ignore part files
     if (pathinfo($target, PATHINFO_EXTENSION) === 'part') {
         return false;
     }
     // Correct Shared folders of other users shared with
     $shares = \OCA\Files_Sharing\Helper::getSharesFromItem($target);
     foreach ($shares as $share) {
         if ((int) $share['share_type'] === \OCP\Share::SHARE_TYPE_USER) {
             self::correctUsersFolder($share['share_with'], $share['file_target']);
         } elseif ((int) $share['share_type'] === \OCP\Share::SHARE_TYPE_GROUP) {
             $users = \OC_Group::usersInGroup($share['share_with']);
             foreach ($users as $user) {
                 self::correctUsersFolder($user, $share['file_target']);
             }
         } else {
             //unique name for group share
             self::correctUsersFolder($share['share_with'], $share['file_target']);
         }
     }
 }