Not sure if you found something that works for you or not, but I have a writeup on how to do that very thing on a windows network drive:
http://tony.halcyonlane.com/blog/2011/09/22/Using-git-at-work-on-a-Windows-network-drive/
From a cmd prompt change to your mapped drive.
$ cd g:
Then cd into your soon to be git repository.
$ cd scripts
Then create an empty git repository. If you do not use the --bare option, you will have issues so don't leave that out.
$ git init --bare
Now if you don't have a local git repository yet, then you can clone your new repository wherever you like by navigating back to your local drive.
$ c:
$ cd work/scripts
$ git clone file://g:scripts
When you clone, you automatically get a remote called "origin" and you can push to the server for safe keeping any time you make changes locally.
$ git push origin master
If you already have a git repository and you just want to push out to the shared drive then you can do this from within your local git dir.
$ git remote add origin file://g:scripts
$ git push origin master
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