[Samba] Wrong permission for mapped drive

[bao]

I have one folder, A, on on machine which is all read-write only. On
another I have a folder with the exact permissions. But when I mapped A
to the second machine, the folder's, and especially the files',
permission get changed somehow to be executable.

I use smbmount to map it, and have tried options such as read-only,
fmask, dmask, but there's no hope.

Any idea is appreciated.

Thanks,