Rudder

The current ACLs methods are ok to define ACLs on single file/file tree, but not suited to give access to give access to upper folders.

The problem is: even the user has the read permissions now for the given file, it cannot access the file, as the permissions are missing on the upper folders. We also cannot use "recursive" mode for a given directory, as this would mean, that the user will get read access to all files under the given directory.

The method should recurse upward starting from the target file and apply the given 'parent_acl' and behave as the current methods for the target.