Directory is missing when starting the docker toolbox

Archive Docker Toolbox
1

Start Docker Toolbox on Windows.

cd /
mkdir docker
ls -l
drwxr-xr-x  2  docker  staff  40 Mar 24 00:47 docker

Restart Docker Toolbox.

cd /
ls -l

docker directory is missing.

I would like to use SSHFS to share the Docker Toolbox Linux files.
However, when I restart the toolbox, the shared directory will disappear.
Container and image information remain.