Are VFS modules stackable?

[Jiri Sasek]

Hi all,

SAM-QFS 5.3 has NFSv4 ACL (based on Solaris acl(2) interface   
...similar to ZFS) so I was testing the following (share) configuration:

[samfs]
    path = /samfs1/.....
    comment = SAM-QFS share
    browseable = yes
    readonly = no
    inherit permissions = yes
    inherit acls = yes
    acl map full control = no
    dos filemode = yes
; To store the DOS attributes in extended attributes.
; https://bugzilla.samba.org/show_bug.cgi?id=5135#c5
...

; set the VFS module
    vfs objects = zfsacl
...

;  store the alternate data stream in ext-attributes
    vfs objects = streams_xattr

;  AIO
    aio read  size = 1
    aio write size = 1
    vfs objects = aio_pthread

; Off-line files support
    vfs objects = samfs

...and it looks only *one* module (first used  ...Solaris uses lazy-load 
by default) was available / share.

Did I configured anything wrong or only one/share VFS module is 
available in Samba?

Please correct me if I am wrong but I remember something like a 
opaque/transparent calls in VFS modules  ...so I was convinced about 
stack-ability of VFS modules.

Thak you in advance,

Jiri