In a time synchronization process, chain of quality information is provided between interconnected nodes, the chain of quality information relating to information regarding accuracy of a clock, a type of timestamping used by a node, a type of link over which a timestamp is provided, and a clock drift parameter indicating the drift characteristics of the clock. Based on the chain of quality information, parameters are determined for a filter that is applied to a sequence of timestamps in order to remove noise from the timestamps, thereby improving accuracy of the time synchronization process.