

did you try setting the default ACL on the shared directory?
section “OBJECT CREATION AND DEFAULT ACLs” here: https://linux.die.net/man/5/acl
I’m not quite sure about how does the inheritance of the default work though. but initially you will need to set the default ACL recursively, so that all existing directories will have the proper default ACL



what causes the limitation? the posts are readable to all registered users