AVRO-3884: Add local-timestamp-nanos and timestamp-nanos

doc/content/en/docs/++version++/Specification/_index.md

@@ -862,6 +862,11 @@ The `timestamp-micros` logical type represents an instant on the global timeline
 
 A `timestamp-micros` logical type annotates an Avro `long`, where the long stores the number of microseconds from the unix epoch, 1 January 1970 00:00:00.000000 UTC.
 
+### Timestamp (nanosecond precision)
+The `timestamp-nanos` logical type represents an instant on the global timeline, independent of a particular time zone or calendar, with a precision of one nanosecond. Please note that time zone information gets lost in this process. Upon reading a value back, we can only reconstruct the instant, but not the original representation. In practice, such timestamps are typically displayed to users in their local time zones, therefore they may be displayed differently depending on the execution environment.
+
+A `timestamp-nanos` logical type annotates an Avro `long`, where the long stores the number of nanoseconds from the unix epoch, 1 January 1970 00:00:00.000000 UTC.
+
 ### Local timestamp (millisecond precision) {#local_timestamp_ms}
 The `local-timestamp-millis` logical type represents a timestamp in a local timezone, regardless of what specific time zone is considered local, with a precision of one millisecond.
 
@@ -872,6 +877,11 @@ The `local-timestamp-micros` logical type represents a timestamp in a local time
 
 A `local-timestamp-micros` logical type annotates an Avro `long`, where the long stores the number of microseconds, from 1 January 1970 00:00:00.000000.
 
+### Local timestamp (nanosecond precision)
+The `local-timestamp-nanos` logical type represents a timestamp in a local timezone, regardless of what specific time zone is considered local, with a precision of one nanosecond.
+
+A `local-timestamp-nanos` logical type annotates an Avro `long`, where the long stores the number of nanoseconds, from 1 January 1970 00:00:00.000000.
+
 ### Duration
 The `duration` logical type represents an amount of time defined by a number of months, days and milliseconds. This is not equivalent to a number of milliseconds, because, depending on the moment in time from which the duration is measured, the number of days in the month and number of milliseconds in a day may differ. Other standard periods such as years, quarters, hours and minutes can be expressed through these basic periods.