Does git fast-import support deltas?

From: Ilya Basin <basinilya@gmail.com>
Date: Apr 19, 2013, 05:29 UTC
Message-ID: <1095757971.20130419092931@gmail.com>
In-Reply-To: <20130418094326.GB11038@thyrsus.com>

Hi list.
Here's what I mean:
1) a created a git repo from a foreign source using git fast-import
2) new commits were added to the foreign source

Can I create a fast-import input stream not containing the commits already existing in my git repo and import it?

I tried to create such streams with:
    cvsps --fast-export -d ...
and from a shallow git repo, but the new commits are not imported
(unless the import stream contains a new branch)

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