Updated Boost Jam to know how to report its minimum supported file modification timestamp resolution (currently reported as part of Boost Jam's version information). This allows external tools using Boost Jam to adapt to Boost Jam's potential ignorance of fine file modification timestamp changes.
For example, Boost Build's internal testing framework may use this information to reduce the time it spends doing nothing by sleeping until enough time passes to make newly created or touched files be correctly recognized by Boost Build.