Filenames not encrypted. Any solutions?

I enabled the default encryption module in my Nextcloud instance. As the docs mentioned, I noticed while the contents of files are encrypted, your cloud service provider can see the file names/directories (!). This is a bit disappointing, since that kind of metadata should have been encrypted too.

Is there a technical reason for the filenames and directory structure to not be encrypted (I can think of ways this could have been done - such as by maintaining an encrypted “map” of filenames and directories)?

Any workaround for this thing?

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