brew update
brew upgrade brew-cask
brew install Caskroom/cask/osxfuse
brew install homebrew/fuse/sshfs
to get rid of the erro message install, install https://github.com/osxfuse/sshfs/releases/download/osxfuse-sshfs-2.5.0/sshfs-2.5.0.pkg
sshfs rpi:/home/pi ~/Desktop/rpi