Thank you for your response to my query. Although the information and example provided a re very useful it does not really address the issue in hand. I don't want to hide the root folders as these are relevant to the user. The user indeed has the ability to create these root folders so hiding them is not an option.
Is there really nothing that can be overridden to enable the renaming/deleting of these root folders? Whilst I can understand the benefits of disabling this feature for true file explorers, I can not say the same for virtual directories created from a database.
I look forward to your response