Limiting access to a particular repository subdirectory

We are currently running Subversion 1.4 through Apache 2.2, authenticating
our users via LDAP and a ³Require valid-user² parameter. This has been
working fine for us. We are bringing in a third party who will only be
working several levels deep in the repository and would like to restrict
their access to these subdirectories only. We would like to use LDAP
groups to accomplish this. Basically what we are looking for is the
following:

/repository/foo (read, write by A, B LDAP groups; no read or write for C
group )
/repository/foo/bar (read, write by A, B, C LDAP groups)

I¹ve tried multiple <Location> directives (with different ³Require
ldap-filter² parameters) into different parts of the same repository, with
no success. ³Require ldap-group² will not work for us as it seems to only
accept one group as argument.

Is this possible? If so, can someone point me in the right direction?
Thank you in advance.

Craig

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