Cannot mount cifs with sfu option

Hello, I am trying to mount smb share from my Windows 2012 R2 server but when I add sfu option to /etc/fstab then I get error when trying to mount.

This works -> //FST01.test.com/e/wop /mnt cifs actimeo=1,credentials=/root/.crd,vers=3.0,nounix,dir_mode=0777,file_mode=0777,_netdev,uid=0,gid=0 0 0

This dont -> //FST01.test.com/e/wop /mnt cifs actimeo=1,credentials=/root/.crd,vers=3.0,nounix,sfu,dir_mode=0777,file_mode=0777,_netdev,uid=0,gid=0 0 0

[root@server01 /]# mount -a mount error(20): Not a directory Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)