The best solution I've found today (2017) is to use Homebrew and Cask to install osxfuse and sshfs. Note that Homebrew core deprecated all FUSE-related formulae in 2020 so you need to install sshfs
from a tap:
brew install --cask osxfusemacfuse
brew install gromgit/fuse/sshfs-mac
And then:
sshfs username@hostname:/remote/directory/path /local/mount/point -ovolname=NAME
It works! :-)