resolution of x-axis in line plots

It seems that currently the resolution of an x axis displaying time values like “07.03.16 21:50”
in line charts can only be set to years months or days.
Will it be possible to set it to hours minutes or even seconds as well ?

No, time is not possible and fractional days neither. You are likely using a wrong chart type at all. You should use an xy-chart. It has “lines” as well.