Just a note about an error that appeared in the console on boot with Volumio 1.55 on a raspberry pi 2:
smbd Bad Share name ‘share’
changing the line
security = share
to
security = user
in the two files
/etc/samba/smb.conf
/var/www/_OS_SETTINGS/etc/samba/smb.conf
makes the error disappear - think this is to do with samba 4 and ‘share’ permissions being depreciated but I wasnt able to understand much of what I read. Im sure there are many people better qualified to comment.