fusefrontend: implement our own Access()

Not having Access() means go-fuse emulates it by looking at Getattr().
This works fine most of the time, but breaks down on sshfs, where
sshfs-benchmark.bash shows this:

	gocryptfs/tests$ ./sshfs-benchmark.bash nuetzlich.net
	working directory: /tmp/sshfs-benchmark.bash.JQC
	sshfs mounted: nuetzlich.net:/tmp -> sshfs.mnt
	gocryptfs mounted: sshfs.mnt/sshfs-benchmark.bash.Wrz/gocryptfs.crypt -> gocryptfs.mnt

	sshfs-benchmark.bash:    sshfs  gocryptfs-on-sshfs
	git init                  3.98                6.80
	rsync                     7.71               10.84
	rm -R                     4.30rm: descend into write-protected directory 'gocryptfs.mnt/git1'?

The go-fuse emulation gets it wrong here because sshfs reports
permissions but does not enforce them.

Implement it ourselves properly.

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