The best solution I've found today (2017) is to use [Homebrew][1] and [Cask][2] to install [osxfuse][3] and [sshfs][4]. Note that Homebrew core [deprecated all FUSE-related formulae](https://github.com/Homebrew/homebrew-core/pull/64491) in 2020 so you need to install `sshfs` from a tap:

    brew install --cask macfuse
    brew install gromgit/fuse/sshfs-mac

And then:

    sshfs username@hostname:/remote/directory/path /local/mount/point -ovolname=NAME

It works! :-)

  [1]: https://brew.sh/
  [2]: https://github.com/Homebrew/homebrew-cask
  [3]: https://osxfuse.github.io/
  [4]: https://github.com/libfuse/sshfs