cannot umount or mount an sshfs volume after ssh connection cut on MAC OS

solve_sshfs.md

1. Find the culprit sshfs process:

   $ pgrep -lf sshfs

2. Kill it:

   $ kill -9 <pid_of_sshfs_process>

3. sudo force unmount the "unavailable" directory:

   $ sudo umount -f <mounted_dir>

4. Remount the now "available" directory with sshfs ... and then tomorrow morning go back to step 1.

REF: macfuse/macfuse#45

A much faster way is:
sudo diskutil umount force [path_local]