If dfs root share (msdfs root = yes) has path set to e.g /tmp everything works
just fine. Once you set it to /tmp/%u, to serve dfs root different for each user
you get directory not accessible message on windows client.
Bug reported by Jacek Stepniewski <email@example.com>
%u substitution cannot be used since Windows client connects to dfs root share
anonymously. Actual logon is done when connecting to dfs node ie. a server's
share. This first GET_DFS_REFERRAL provides no information about user credentials.