You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: about_windows.go
    path of file: ./repos/rclone/backend/local
    
    the code of the file until where you have to start completion: //go:build windows
// +build windows

package local

import (
	"context"
	"fmt"
	"syscall"
	"unsafe"

	"github.com/rclone/rclone/fs"
)

var getFreeDiskSpace = syscall.NewLazyDLL("kernel32.dll").NewProc("GetDiskFreeSpaceExW")

// About gets quota information
func (f *Fs) About(ctx context.Context) (*fs.Usage, error) {
	var available, total, free int64
	root, e := syscall.UTF16PtrFromString(f.root)
	if e != nil {
		return nil, fmt.Errorf("failed to read disk usage: %w", e)
	}
	_, _, e1 := getFreeDiskSpace.Call(
		uintptr(unsafe.Pointer(root)),
		uintptr(unsafe.Pointer(&available)), // lpFreeBytesAvailable - for 
    
func (f *Fs) About(ctx context.Context) (*fs.Usage, error) {
	var available, total, free int64
	root, e := syscall.UTF16PtrFromString(f.root)
	if e != nil {
		return nil, fmt.Errorf("failed to read disk usage: %w", e)
	}
	_, _, e1 := getFreeDiskSpace.Call(
		uintptr(unsafe.Pointer(root)),
		uintptr(unsafe.Pointer(&available)), // lpFreeBytesAvailable - for this user
		uintptr(unsafe.Pointer(&total)),     // lpTotalNumberOfBytes
		uintptr(unsafe.Pointer(&free)),      // lpTotalNumberOfFreeBytes
	)
	if e1 != syscall.Errno(0) {
		return nil, fmt.Errorf("failed to read disk usage: %w", e1)
	}
	usage := &fs.Usage{
		Total: fs.NewUsageValue(total),        // quota of bytes that can be used
		Used:  fs.NewUsageValue(total - free), // bytes in use
		Free:  fs.NewUsageValue(available),    // bytes which can be uploaded before reaching the quota
	}
	return usage, nil
}