FUSE: add os specific mount options

related to https://github.com/chrislusf/seaweedfs/issues/1094

weed/command/mount_linux.go

@@ -0,0 +1,12 @@
+package command
+
+import (
+
+	"github.com/seaweedfs/fuse"
+)
+
+func osSpecificMountOptions() []fuse.MountOption {
+	return []fuse.MountOption{
+		fuse.AllowNonEmptyMount(),
+	}
+}