acl enabled FS but cannot "setfacl"

Hi fellas,

I have the following problem on a 8.1-p1 x86 FreeBSD machine.

Code:
[root@mainserver /dev/usb]# mount
/dev/mirror/gm0s1a on / (ufs, local, soft-updates, acls)
but
Code:
[root@mainserver /dev/usb]# setfacl -m u::,g:saned:r-x,o:: 1.2.0
setfacl: 1.2.0: acl_get_file() failed: Operation not supported

Normally, "setfacl: <whatever> : acl_get_file() failed: Operation not supported" means that the ACL's were not set on the FS but if you look at the "mount" output, you will see they were.

The reason I want to do the aforementioned action is because I need more than 1 group to have access to a particular USB device (sure, I can create a 3rd group and include some user names there but I'm curious about this ACL thing here).

Are the nodes under /dev somehow prohibited to have an ACL entry ?
 
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