Initial commit

Proof-of-concept implementation. Bugs will occur.

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

@@ -0,0 +1,11 @@
+package fuse
+
+import "fmt"
+
+func (s *Server) setSplice() {
+	s.canSplice = false
+}
+
+func (ms *Server) trySplice(header []byte, req *request, fdData *readResultFd) error {
+	return fmt.Errorf("unimplemented")
+}