CVSUP'ing specific directories in ports/source

[aVANTGUARD]

People,
	I've been an OpenBSD user for some time now, and I've started using
FreeBSD, and I'm having an issue converting over. In FreeBSD, to update my
ports tree I run:

$ cvsup -g -L 2 ports-supfile 

Where ports-supfile is a file dictating where to grab the files from and
which ports 'packages' to get (ie. Ports-devel). On OpenBSD I was able to do
this:

$ cvsup -d anoncvs at wiretapped.net:/cvs get ports/net/samba #OR
$ cvsup -d anoncvs at wiretapped.net:/cvs get src/usr.sbin/sendmail

(Note this worked for the current release, if I wanted older releases, I
added -rOPENBSD_3_0 for 3.0 for example) 

to get *specific* ports or directories from CVS. 

How can I do this in FreeBSD? (I've tried, with no luck) Do I need a
specific server to support this sort of CVSUP'ing?

I'm not subscribed, so I'd appreciate any replies were CC:ed to me. :)

Thanks in advance.

/avant