system|user,binmode|textmode,exec,cygexec,cygdrive,mixed,
notexec,managed,nosuid,devfs,proc,noumount
-If the argument is "/cygdrive", just the volume mount settings are returned.
+If the argument is "/cygdrive", then just the volume mount settings,
+and the cygdrive mount prefix are returned.
User mounts override system mounts.
$ perl -e 'print Cygwin::mount_flags "/usr/bin"'
system,binmode,cygexec
$ perl -e 'print Cygwin::mount_flags "/cygdrive"'
- binmode,cygdrive
+ binmode,cygdrive,/cygdrive
=item C<Cygwin::is_binmount>