For the time being, that’s true. Don’t know if there’s any plan to extend it in the near future.
But should be possible to do it with an extra tool (explorer, RSAT, smbcacls, samba-tool… on NS7 it was also possible through setfacl):
It is possible to edit ACLs with a SMB client, like the Windows Explorer application installed with Windows Pro flavours, or the smbcacls command provided by the Samba project.