如何从纪元微秒或纳秒创建Java Instant？

import java.time.Instant;

public class Main {
    public static void main(String[] args) {
        long epochMillis = 1634567890123L;
        long epochNanos = 1634567890123456789L;

        Instant instantFromMillis = Instant.ofEpochMilli(epochMillis);
        Instant instantFromNanos = Instant.ofEpochNano(epochNanos);

        System.out.println("Instant from milliseconds: " + instantFromMillis);
        System.out.println("Instant from nanoseconds: " + instantFromNanos);
    }
}

Instant from milliseconds: 2021-10-18T10:11:30.123Z
Instant from nanoseconds: 2021-10-18T10:11:30.123456789Z