mmap errors related to using encfs

[Mayuresh <mayuresh%acm.org@localhost>]

Trying out filesystems/fuse-encfs on NetBSD 8.0 amd64.

# mount | grep puff
/dev/puffs on /mnt/foo type puffs|refuse:encfs (nodev, nosuid)

# cd /mnt/foo/

# git init --bare
error: unable to mmap '/mnt/foo/config': Operation not supported
fatal: could not set 'core.filemode' to 'true'

This problem occurs with encfs mounted directory only. From the error
message it does not look like a git problem, rather some interaction
between mmap and encfs.

Would be interesting to know what's happening and is it possible to deal
with this error.

Mayuresh