How to give navigation permission to sub-folders and restrict top folders

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My team is building a Sharepoint site as a document repository with many folder levels. We are migrating data from another cloud server and importing security access profiles using third party tools. The issue is that when users only have access to a certain level of folders, the navigation seems impossible since the top levels folders are not visible to them. I've included the picture below to showcase how would 3 users view a particular structure of folders given their security access levels.

structure.png

Bear in mind we are talking about thousands of folders with lots of hierarchy breaks, and that the customer wants to keep the current security access profiles as is, as they can't afford to have any issues with confidential data being accessible.

 

Any suggestions on how to make this possible?

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