svnserve + ssh

My svnserve runs through ssh smoothly.. Again Subversion lights
as a serious piece of software :)

But I don't know how to restrict it to a required directory.
My repo lies in /home/svn, so my URI looks like this:
svn co svn+ssh://repo.vernet.pl/home/svn/bip/trunk

How can I restrict (like running svnserve -r) svn through ssh?

Thanks for your patience..

-- 
  Marcin Gil
    email#   mgil : vernet pl | GaduGadu ID# 185057
    JID# dentharg : chrome pl | 
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