How to set @timestamp precision to microsecond

Elastic Stack Beats
1

Hi elastic experts, I am using ECK Beat to collect the container logs of applications deployed in k8s cluster. The type of beat is filebeat. I can see the logs shipped from beat to logstash have the field @timestamp, the precision of timestamp is now milliseconds. The raw log files located in /var/log/containers have the timestamp with higher nanoseconds precision. I guess @timestamp is generated based on the timestamp from the raw log file, I want @timestamp has microseconds precision, how can I configure ECK Beat(or others?) to achieve it? Thanks.

The log shipped to logstash

{
          "tags" => [
        [0] "beats_input_codec_plain_applied"
    ],
      "@version" => "1",
           "k8s" => {
        "container" => "logstash",
              "pod" => "eck-stack-eck-logstash-ls-1",
             "node" => "shc01",
        "namespace" => "logging"
    },
    "@timestamp" => 2024-09-06T03:52:40.697Z,
       "message" => "           \"k8s\" => {"
}

The raw log in /var/log/containers/

2024-09-06T11:03:59.898513895+08:00 stdout F This is the first task
2024-09-06T11:04:04.900511243+08:00 stdout F This is the first task
2024-09-06T11:04:09.902578864+08:00 stdout F This is the first task