rfjakob/gocryptfs ? reverse-engineered prompt

Build me a command line tool that creates an encrypted folder I can use like a normal directory.

I want to be able to set it up with an init command, enter a password, and then mount the encrypted storage over a plain folder so I can read and write files normally. The actual data on disk should stay encrypted, including file names, and it should work as a FUSE style overlay filesystem on Linux. If you can, also support a reverse mode that takes an existing plain folder and shows me the encrypted version of it.

Please include a way to unmount cleanly, show basic help, and make the output feel polished and usable. Security matters a lot, so keep the encrypted format safe and make sure the master key is handled carefully. If you need to check current FUSE or crypto docs online while building it, go ahead.