Can I specify a "root" folder for a user?

I am wondering if there is a way how I can set a root folder for a user. For example, I have the following folder hierarchy in the Spotfire library:

  1. / (root)
    1. DNA
      1. UserFolder
        1. User_123

Can I use specify what would be the root folder for a user to be "User_123" - the user won't be able to go up the tree (using the WebPlayer) but only inside his own folder

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