I just remove the Domain users from the sub folder ( QNAP NAS and Windows ACL enable)
\\ Sales\subfolder
When I try to access the subfolder folder I get "windows cannot access \\\\
Sales\subfolder you do not have permission to access.....".
The same happens when logged in with the system administrator account.
When I right-click the folder and choose Properties > Security, the Current owner field
shows "you do not have permission to view or edit this objects permision settings"
And it won't allow either of the listed administrator accounts to take ownership.
When I choose Properties > Security > Advanced > Owner, the Current owner field
also shows "Unable set new owner." And it won't allow me to Edit it either.