Permissions on files/directories are cluttered/mixed up !
**UPDATED** If you run into permissions problems or your directories' security ACLs are populated by some unwanted groups/users, you need to make sure that:
- File ../etc/fstab exists with at least the content below:
none /cygdrive cygdrive binary,posix=0,user,noacl 0 0
That will instruct Cygwin not to touch permissions.