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Linux 4.1+ with ext4 supports filesystem level encryption, and it encrypts filenames. The implementation seems very complex, I'm not sure how mature this feature is. I think the state is probably "not production ready", but I don't know very much about this.

http://blog.quarkslab.com/a-glimpse-of-ext4-filesystem-level...

https://docs.google.com/document/d/1ft26lUQyuSpiu6VleP70_npa...

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This can't be used for assymetric encryption. The reason you can still see files and filenames on normally encrypted drives is because your OS holds the encryption key AND decryption key in memory (they're actually the same because it's using symmetric encryption). The problem with the assymetric case is that you no longer have the decryption key, so if you encrypt a filename, you don't get to refer to the file anymore, of course unless (as another user commented) you encrypt the filename you're using to reference the file every time you reference the file, which isn't a terrible idea.

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