bzr fast-import --import-marks

[Eli Zaretskii]

> From: Jelmer Vernooij <jelmer at samba.org>
> Cc: bazaar at lists.canonical.com
> Date: Thu, 10 Mar 2011 03:00:18 +0100
> 
> This is the correct behaviour. A marks file generated by git fast-export
> should be used again with git fast-export itself, not with bzr
> fast-import/fast-export. 

Thanks.

So when would one use the --import-marks option to "bzr fast-import"?
And with what files?