Copying embedded directories doesn't work on Windows

[tomaswarynyca]

Hi @otiai10, #108 is not working for Windows, can you check what's going on please?
I don't have any errors, I've been printing OnError but it's always nil.
I don't know how I can help you to solve this problem :/

[otiai10]

First, could you please send a pull-request in which this Windows test fails.
https://github.com/otiai10/copy/blob/main/.github/workflows/go.yml