如何查看使用Google Drive SDK请求访问Google Drive文件的用户列表？

I am busy writing a Google spreadsheet with the Sheets API. I have a process that gives users access to the created spreadsheet (via database table).

Spreadsheets can be shared on the internet, and when you share a spreadsheet; the user can request access to the sheet from the owner.

The question is whether it's possible to get the list of users/email addresses that requested access using the Drive SDK?

I am using go (language doesn't matter here) and currently give access like this:

func (g *GoogleSheetsService) AddUserToSpreadsheet(email string) error {
    _, err := g.DriveSDK.Permissions.Insert(g.sheetID, &drive.Permission{
        Type:  "user",
        Value: email,
        Role:  "reader",
    }).Do()
    if err != nil {
        return err
    }

    return nil
}