[Samba] How to give one user write permissions to HOME shares

[Dan Didier]

mmurrock can browse, but he can't write.  Is there an easy way to add write
access for the mmurrock user?

here is my homes share:

[homes]
   comment = Home Directories
   browseable = no
   writable = yes
   valid users = %S, mmurrock
   create mode = 0664
   directory mode = 0775

Thanks,
Dan Didier