How to enable unix file permissions on samba share with smb 2.0+

I am trying to set permissions on a Samba share mounted with vers=3.0, but it does not work (with vers=2.1 or vers=2.0 also issue is present).

As per SMB3-Linux cifsacl option is needed for setting the permission bits, but if that option is used the folder does not mount:

# mount -t cifs //server.lan/aaditya /home/roaming/SERVER/aaditya -o 'username=aaditya,domain=server.lan,password=mypass,cifsacl,vers=3.0,nobrl,mfsymlinks,sfu,uid=1274545246,gid=1274544641'

mount error(95): Operation not supported Refer to the mount.cifs(8)
manual page (e.g. man mount.cifs)

Is there something that I am missing?

It works with vers=1.0 which has unix extensions but trying to avoid it as SMB 2.0+ seems to have much better performance and design (here and here).

Client details:

# mount.cifs -V
mount.cifs version: 6.4

# uname -srm
Linux 4.10.0-38-lowlatency x86_64

# lsb_release -ird
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:    16.04

Server details:

$ uname -srm
Linux 4.4.0-97-generic x86_64

$ lsb_release -ird
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:    16.04

$ samba --version
Version 4.6.7-Ubuntu