How to handle fileinfo.sys() on different operating systems

Question

Wish to extract file properties for files within one go package which can be used in both linux and windows.

Using go, Within windows i can successfully get the properties of a file:

path = Filename, i.e. c:\123.txt

fileinfo, _ := os.Stat(path)
stat := fileinfo.Sys().(*syscall.Win32FileAttributeData)
aTimeSince = time.Since(time.Unix(0, stat.LastAccessTime.Nanoseconds()))
cTimeSince = time.Since(time.Unix(0, stat.CreationTime.Nanoseconds()))
mTimeSince = time.Since(time.Unix(0, stat.LastWriteTime.Nanoseconds()))

Likewise i can also get the same info within Linux:

fileinfo, _ := os.Stat(path)
aTime = fileinfo.Sys().(*syscall.Stat_t).Atim
cTime = fileinfo.Sys().(*syscall.Stat_t).Ctim
mTime = fileinfo.Sys().(*syscall.Stat_t).Mtim
aTimeSince = time.Since(time.Unix(aTime.Sec, aTime.Nsec))
cTimeSince = time.Since(time.Unix(cTime.Sec, cTime.Nsec))
mTimeSince = time.Since(time.Unix(mTime.Sec, mTime.Nsec))

However when i merge the two statements into one go file, Linux rejects the windows code, and windows rejects the Linux code.

Reading the go manual, states i need to specify the $GOOS to the operating system, but unsure how to do this and unable to find it anywhere.

A complete sample of code with the if runtime.GOOS statement:

if runtime.GOOS == "windows" {
    fileinfo, _ := os.Stat(path)
    stat := fileinfo.Sys().(*syscall.Win32FileAttributeData)
    aTimeSince = time.Since(time.Unix(0, stat.LastAccessTime.Nanoseconds()))
    cTimeSince = time.Since(time.Unix(0, stat.CreationTime.Nanoseconds()))
    mTimeSince = time.Since(time.Unix(0, stat.LastWriteTime.Nanoseconds()))
} else {
    fileinfo, _ := os.Stat(path)
    aTime = fileinfo.Sys().(*syscall.Stat_t).Atim
    cTime = fileinfo.Sys().(*syscall.Stat_t).Ctim
    mTime = fileinfo.Sys().(*syscall.Stat_t).Mtim
    aTimeSince = time.Since(time.Unix(aTime.Sec, aTime.Nsec))
    cTimeSince = time.Since(time.Unix(cTime.Sec, cTime.Nsec))
    mTimeSince = time.Since(time.Unix(mTime.Sec, mTime.Nsec))
}

I also realise that fileinfo.ModTime() will give me the modified date\time for both operating systems, but this is not reflected correctly within Linux, so if say a file is moved, the cTime is updated, not the modified time and i need to check for when a last file has been modified,changed, accessed etc.

Any help would be greatly appreciated, thank you.