From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Riesen <raa.lkml@gmail.com>
Subject: Re: [PATCH] Teach filter-branch about subdirectory filtering
Date: Fri, 8 Jun 2007 23:05:05 +0200
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To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
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Johannes Schindelin, Fri, Jun 08, 2007 02:30:35 +0200:
> 
> With git-filter-branch --subdirectory-filter <subdirectory> you can
> get at the history, as seen by a certain subdirectory. The history
> of the rewritten branch will only contain commits that touched that
> subdirectory, and the subdirectory will be rewritten to be the new
> project root.
> 

Maybe it could be made more general

    --subdirectory-filter <from> [--subdirectory-filter-to <to>]

<to> meaning root by default, and allow multiple filters to be set?
You would have to deal with file name conflicts in case some filters
refer to the same target directory, though.

It has already been asked how to split a project into many projects
based on directory boundaries. That'd help...