Rick,
I think what you are asking about pertains to running a Samba server on the OS/2 side so that you can share one of your local directories, yes?
I do not have this configured here, but that server component does certainly exist and can be deployed. Not sure though if ArcaMapper, or NetDrive for that matter have any bearing on that functionality: in other words, the Samba server config is entirely manual and separate from those two.
To accomplish what you are talking about I found it much easier to create a separate share on my NAS box which is accessible by all other LAN devices. I use that as my exchange gateway and that does not require me to run the Samba server on my OS/2 box.
Granted, that approach works b/c I do NOT need to dynamically share massive amounts of OS/2 data.