Support for domain-level “hide unreadable folders” - is a feature enabling domain administrators to choose to hide the existence of folders from users who do not have the ability to read them.

If this option is enabled (through Domain Settings or the API) then users who open a folder will only see subfolders within it for which they have READ permission or higher.

A common use-case for this feature is where a domain administrator wishes to create a “Clients” folder with a sub-folder for each client but does not wish for client users who can open the "Clients" folder to be able to see the full listing of subfolders (since it includes the names of clients).