I’m using the EasySSHFS package from F-Droid. Similar to mounting on Linux, you must create a folder as the mount point. For example, on my phone I first manually made the folder called /storage/self/primary/mnt in a local root terminal in connectbot (create a connection, protocol local, type in “su” to become root, grant access when prompted, then type “mkdir /storage/self/primary/mnt” to create the directory)
In the EasySSHFS new connection setup, i put that path in the seventh field on the form. In the sixth field is the path on the remote server that you wish to mount, for example /home/khorak
In the other fields give the username and password (or key file)
The last field contains the mount options, I did not need to change them but you can if needed.
EasySSHFS needs to be allowed root access.
Once you mount, the folder created previously at /storage/self/primary/mnt will contain the contents of the remote server. In my case, using this path makes it appear like it is on the sdcard in android. I can watch videos using VLC or listen to mp3 songs etc as if they are local on my phone.