Sharing folder with specific users from network

Question

I've created small network in my office. Is there any way to share folders for only one user or a specific list of given users?

Lets say, we have

• a folder test that we want to share only with user "John" from the first network PC, and hide from another network users,
• a folder test2 that we want share with only "Georgie" from the second network PC, and hide from another network users.

Is there any way to organize sharing this way on Windows XP or Windows 7 machines?