Well the posix conglomerate had such big problems implementing a ACL (mostly because of blabla)... Then Microsoft did one for NT which was then took over to NFS

Well the posix conglomerate had such big problems implementing a ACL (mostly because of blabla)... Then Microsoft did one for NT which was then took over to NFS, later the posix peoples decided on a ACL but no one wanted it anymore. However FreeBSD supports both, but the NFS/Microsoft one is the standard.