Hello,
years ago I built my NAS using OMV 3.x. Setting up samba wasn't a big deal, Access-based-enumeration worked with the workaround described here (Hide Shared Folders that a User can't access (workaround for access based share enum)). Everything was fine.
I bought new harddrives (to enlarge the system) and changed to OMV 4. I created the filesystem, made a smb-share and copied my files to the new OMV 4-system.
But abe isn't working no matter what I do. Even with the workaround I mentioned before - not a chance.
I went back to OMV 3 but again no luck. I don't know how I made it years ago. 
Any suggestions?
Thank you in advance.
Roland