rsync - Jun 2012 - Rsync doesn't seem to be able to preserve permission bits/flags in Cygwin

Hi:

I'm using the following arguments to rsync when backing up, and yet
the flags are not preserved when I copy:

% rsync -aP <options deleted>

Nancy at macki /cygdrive/c/Documents and Settings/Nancy/My Documents
$ ls -al z1.jpg
-rwxr-xr-x+ 1 Nancy None 118258 Aug 29  2011 z1.jpg

Nancy at macki /cygdrive/f/macki/back-2012-06-04T16:57:38/Nancy/My Documents
$ ls -al z1.jpg
-rw-r--r-- 1 Nancy None 118258 Aug 29  2011 z1.jpg

I was wondering if this is common with Cygwin. The NAS is connected using CIFS.

Thanks,

-Clint