What happens when I share a folder that contains a shared subfolder?

I have reorganized my folders and moved a shared folder original_share into a new folder new_parent_folder.

new_parent_folder contains more stuff that I would also like to share with the same person whom I shared original_share with.

What will happen when I share new_parent_folder to this other person as well? Will he get duplicate folder, once for original_share and also for new_parent_folder that contains original_share? If so, what would be the best way to avoid downloading tons of data and creating a mess on my collaborator’s hard drive?