MIlliseconds difference after migrating data from Sybase to Sql for datetime columns

For datetime values having milliseconds in it, post migrating this values from Sybase to SQL, we get the 4th value in "millisecond" get rounded. For eg -
In Sybase- 01/01/2015 10:00:00:2056

it comes in SQL :
In SQL - 01/01/2015 10:00:00:2057

SQL Server DBA