Understanding ACS7xx Current Sensor

Hey guys, sorry for digging up this old post. I am making the PCB right now and I am wondering what is the purpose of the 0.1uF cap.

Let say I am going to include 10 ACS714 on a single board. According to the data sheet, a 0.1uF cap is suppose to be connected from VCC to GND. Can I just use one cap for all the ACS714? Should it be 0.1uF or 1uF? Thank you so much!