worka

I had success with this.
Put this line in /etc/fstab

//file-sever/thing /mymountpoint smbfs credentials=/etc/file-server-credentials.conf,gid=fileserverusers,fmask=660 0 0

The file /etc/file-server-credentials.conf contains the log on information
username=someusername
password=apassword

Then lock down the permissions on /etc/file-server-credentials.conf to restrict read access.

gid=fileserverusers is to allow a group of users on the local linux box read write access to the /mymountpoint. This access is controlled my the fmask=660
groupadd fileserverusers
Edit /etc/groups and add the approriate users to fileserverusers group.