go fmt
The new `go fmt` adds `//go:build` lines (https://golang.org/doc/go1.17#tools). Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
Signed-off-by: Kunal Kushwaha <kushwaha_kunal_v7@lab.ntt.co.jp>
`func Lookup(dir string) (Info, error)` returns the mount info that corresponds to the dir Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>