gocryptfs is an encrypted overlay filesystem written in Go. gocryptfs uses file-based encryption that is implemented as a mountable FUSE filesystem. Each file in gocryptfs is stored one corresponding encrypted file on the hard disk. Encrypted files are stored in CIPHERDIR, and a plain-text view can be presented by mounting the filesystem at MOUNTPOINT.

gocryptfs was inspired by encfs and strives to fix its security issues while providing good performance.

Homepage of gocrypts: https://nuetzlich.net/gocryptfs/

The working overlay for Gentoo where you can find sys-fs/gocrypts ebuild is: holgersson-overlay
But this ebuild doesn't work in funtoo because it requires EAPI 8 while funtoo's portage has EAPI 7.