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: unshare_linux.go
    path of file: ./repos/podman/vendor/github.com/containers/storage/pkg/unshare
    
    the code of the file until where you have to start completion: //go:build linux
// +build linux

package un
    
func hasFullUsersMappings() (bool, error) {
	content, err := os.ReadFile("/proc/self/uid_map")
	if err != nil {
		return false, err
	}
	// The kernel rejects attempts to create mappings where either starting
	// point is (u32)-1: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/user_namespace.c?id=af3e9579ecfb#n1006 .
	// So, if the uid_map contains 4294967295, the entire IDs space is available in the
	// user namespace, so it is likely the initial user namespace.
	return bytes.Contains(content, []byte("4294967295")), nil
}