ufs snapshot help

[jungle Boogie]

Hello All,

While zfs is the better choice for virtually everything, I can't quite
support it on my old hardware--plus I want to learn the basics.

I'm running this:
10.1-STABLE FreeBSD 10.1-STABLE #0 r281766M

Following this simple page:
https://www.freebsd.org/doc/handbook/snapshots.html

# mount -u -o snapshot /var/snapshot/snap /var
mount: /var/snapshot/snap: Invalid argument

What's invalid about my arguments?

I THINK this page was updated August of last year:
https://svnweb.freebsd.org/doc/head/en_US.ISO8859-1/books/handbook/disks/chapter.xml?r1=44644&r2=44645&

So I think its still current but I must be doing something wrong.

Any ideas?

Thanks!

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