First, you should not have 2 admin accounts unless security is not an issue for you. But since you are talking about restrictions to one of the accounts, then make it a user account with restrictions and not an admin account. The whole reason it's called "Admin" means that he can do what he wants. If you need some level of restriction for an admin account you can read this article:
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About your question specifically, I didn't fully understand where the problem stands. Is there a folder that you want to restrict access to on an Admin account?