vendor: add github.com/hanwen/go-fuse/v2@master for mount2

vendor/github.com/hanwen/go-fuse/v2/fuse/request_linux.go

@@ -0,0 +1,13 @@
+// Copyright 2016 the Go-FUSE Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fuse
+
+const outputHeaderSize = 160
+
+const (
+	_FUSE_KERNEL_VERSION   = 7
+	_MINIMUM_MINOR_VERSION = 12
+	_OUR_MINOR_VERSION     = 28
+)