[Samba] Add permission? (was How to create a write-only share?)

[Ash Gosh]

Need your help! I'm very confised and tired, tried a lot of variants
but still at the start, even lost all understanding how the
permissions and masks works.
Please write me a config for the following case:

There is a directory:

'/home/shared/door', owned by 'michael:office'
shared via samba as '[door]'

How can I configure the FS and samba to let 'michael' full control of
directory content and let members of gorup 'office' to add files to
this Samba share from Windows machine. But members of group 'office'
and everyonne esle should not be able to read the files and even see
the contents of the share (contents of directory).


Thanks in advance,
Ash Gosh.