Using a filemap with hgsubversion

I wanted to clone a svn-repository with mercurial using my preferred hgsubversion, but I was only interested in on directory. I noticed that there was a --filemap option but I found no documentation for this until I discovered that it is the same syntax the ConvertExtension has. So if you want to use a filemap check their documentation on filemaps.

If you want to exclude all directories by default and only include specific directories like me use this:
exclude /
include foo/bar

Another Hint: As mentioned by danchr in the ticket #175 your next pull will not obey this filemap. So make sure you place your filemap in .hg/svn/filemap and add this to the .hg/hgrc of your clone:
[hgsubversion]
filemap = .hg/svn/filemap