go golang get disk usage free space remain info

package main

import (
"fmt"
"syscall"
)

func main() {
fmt.Println(DiskUsage("./"))
}

func DiskUsage(path string) uint64 {
fs := syscall.Statfs_t{}
err := syscall.Statfs(path, &fs)
if err != nil {
return 0
}
return fs.Bfree * uint64(fs.Bsize)
}

//All space   = fs.Blocks * uint64(fs.Bsize)
//Free space = fs.Bfree * uint64(fs.Bsize)
//Used space= fs.All - disk.Free