https://forum.syncthing.net/t/filesystem-watcher-errors-getfileinformationbyhandle-w-incorrect-function/12974

notifyWinRoot.go

package main

import (
	"fmt"
	"strings"

	"github.com/syncthing/notify"
)

var drive = "C"

func main() {
	lower := strings.ToLower(drive)
	upper := strings.ToUpper(drive)
	for _, prefix := range []string{`\\?\`, ""} {
		c := make(chan notify.EventInfo)
		for _, d := range []string{upper, lower} {
			for _, sep := range []string{"", `\`} {
				for _, rec := range []string{"...", ""} {
					path := prefix + d + ":" + sep + rec
					err := notify.Watch(path, c, notify.All)
					fmt.Printf("Watching \"%v\": %v\n", path, err)
					if err == nil {
						notify.Stop(c)
					}
				}
			}
		}
	}
}