How to set Log timestamp level as Millisecond or Microsecond

Now the Log timestamp level look like this
[**%Y-%m-%d %H:%M:%S**] %v
The minimum level is **Second**, but sometimes need observe lower-level timestamps, such as Millisecond or Microsecond. How to set? Thank you.

No file, test, or entry point is named. Start by locating the log timestamp formatting and configuration in the repository, then determine whether millisecond and microsecond precision are supported; done means the requested timestamp levels can be configured and their behavior is covered by the relevant checks.

Written by the indexing model from the issue text.