I am not a glob guru, and it is not easy to check whether indeed dustmite is only reducing the files one wants to reduce: it would greatly help me if there'd be some examples of how to use --reduce-only.
In my current case, I want to only reduce files in the fs directory, which is inside a subdirectory, and also contains subdirectories itself. I'm guessing --reduce-only="**/fs/*" will do the trick, but I really don't know.
Thanks :)