* origin/master: (28 commits)
  nodefs: use offset for MemRegularFile reads. Test it.
  zipfs: fix and test tarfs
  nodefs: don't tweak MemRegularFile mode
  nodefs: fix builds on darwin
  example/hello: convert hello to new nodefs API
  nodefs: add MemRegularFile.Flush
  example/statfs: use new nodefs library
  example/loopback: use new nodefs library
  nodefs: document Access
  example/zipfs: use new nodefs
  nodefs: use bridge.getattr for Access calculation
  example/multizip: use new nodefs package.
  nodefs: comment ExampleNewPersistentInode
  nodefs: add Options.DefaultPermissions
  zipfs: rewrite using new nodefs API.
  nodefs: use testMount in tests
  nodefs: don't pass root into Options.OnAdd
  nodefs: add Inode.RmAllChildren
  nodefs: various fixes
  nodefs: check that default Create returns EROFS
  ...