swarm/api: support mounting manifests via FUSE (#3690)

vendor/bazil.org/fuse/unmount_std.go

@@ -0,0 +1,17 @@
+// +build !linux
+
+package fuse
+
+import (
+	"os"
+	"syscall"
+)
+
+func unmount(dir string) error {
+	err := syscall.Unmount(dir, 0)
+	if err != nil {
+		err = &os.PathError{Op: "unmount", Path: dir, Err: err}
+		return err
+	}
+	return nil
+}