typedef struct {
    QWORD    qwTimestampPeriodFs;
    DWORD    dwFlags;
} TIMESTAMPINFO, *LPTIMESTAMPINFO;

qwTimestampPeriodFs 

Set on return from GetRtTimestampInfo to the period of the timestamp counter in femtoseconds.

dwFlags 

Set on return to indicate the features of the configured timestamp counter.

Possible values include:

TS_SYNCHRONOUS

If this bit is set then the source has the same value on every node.

TS_COORDINATED

If this bit is set then the source increments at the same rate on every node, but might not contain the same value.

If neither bit is set then the clock source is different on each node and is not guaranteed to increment at exactly the same rate.