How to restrict Mac on WebDav?

Question

IIS

Greetings!)
Organized by webdav, on IIS. Windows access is used as an authorization module.
(in order to provide unified access not only via webdav)
But bad luck ...
Mac os clients see those folders that they should not see. And in those folders where there are certain access rights - this very access floats. Please tell me how to solve this?
Without affecting the already organized access control system (if possible, of course)