I need one "master" user (not members... actual Umbraco users that can log into the CMS). That master user needs to be able to create "restricted" users. Those restricted users should be able to create members. Restricted users should only be able to see members they created.

For example, the master user is Bob. Bob creates Jack and Jane, both restricted users. Jack creates the member Alice, and Jane creates the member Adam. Jack can't see Adam and Jane can't see Alice. Here is what each of them can see:

• Bob can see: Jack/Jane/Alice/Adam.
• Jack can see: Alice.
• Jane can see: Adam.

Is this possible out of the box with Umbraco (i.e., without having to resort to using the API)?

I see that I can restrict users to the "Members" section, but is there anything more granular than that? I'm imagining something like setting a start member folder as you can with the content section (though the only "folders" for members are letters of the alphabet, so that doesn't seem possible from what I can tell).