Hi Jon,
This is obviously not possible in Stash at this stage.
It could be done fairly easily as a plugin. You could add a pre-receive hook that looks at the new commits, calculates what files/directories have been modified and rejects/accepts the push accordingly. Here is an example of a hook I wrote that blocks pushes with large files, which might be a good place to start
That said, my advice would be to split up your repository into smaller repositories and define your permissions at that level. This is something that will play better with Stash (and most other Git hosting solutions which don't support this feature either). At this point you could have repository write permissions (or branch permissions on master) and only certain people can push/merge to them.
Cheers,
Charles
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