Why Mono and Oligosaccarides are Soluble in Water but not Polysaccharides?

The breaking apart of solute particles by solute is called solubility. For example when NaCl is put in water it is broken into Na ans Cl particles. Water break them apart by surrounding each through its molecules H2O by ion dipole method.
 Oils are insoluble in water because their particles can't be separated by water. We can force them temporarily but after awhile the mutually coagulate.
 Glucose, a monosaccaride is soluble in water by HB method where by water takes apart individual glucose molecule, C6H12O6 , and surrounds it through its molecules, H2O . Same is the case with oligosaccarides like sugar C12H22O11.
 But polysaccharides are unsoluble in water because there we don't have individual particles to be taken apart by water. They are actually strands of molecules called polymers. Although water does make HB but can't isolate individual particles, molecules. They are polymers like (C6H12O6)n.
 We can fore solubility. Eg alloys. Where we dissolve a solid in solid. Although ordinarily we cant say that solid is soluble in solid.
 But actually solubility is the dissolution of some thing gas liguid or solid in a liquid.